Catherine Age Halsey, MD, PhD (SN: CC-409871),  was an effective praised scientist and you will previous staff turned into prisoner of your Workplace of Naval intelligence, best-known given that blogger of the SPARTAN-II System and you will Mjolnir Pushed Assault Armour.
 Because the she expanded old, Halsey grabbed some significant steps to safeguard their kept Spartans, also supposed up against the armed forces law to do so – an alternative that would trigger her ultimate stop from the ONI’s Kilo-Five into the 2553. In 2558 whenever Admiral Osman purchased Catherine’s performance, Catherine fled the brand new assassination try and defected in order to a’s Covenant.
Very early lifestyle
Catherine Halsey was created on the Endymion to your February 19th, 2492.  The lady youngsters will give a look from what would end up being an excellent guaranteeing career. She try “wiser than just the girl parents, always learning, speaking, discovering, and you may desperate to express the woman studies with anybody who would listen.”  She try provided for Scenario by the Dean off Physical Research in the  From this point, during the fifteen years dated, Dr. Halsey has already been writing this lady 2nd Doctoral Thesis paper, in which she chatted about archaic range purchases.  It’s very understood one sooner or later in her own early lifestyle, she administered the production of the latest template to have third-generation wise phony intelligences.  She is actually Vice-admiral Ysionris Jeromi’s superstar student as well.  ONI recruited the lady from inside the 2510 since a civil associate and introduced the girl to arrive.  Into the August of the seasons, Halsey purchased a small, hardback diary from inside the a store with the Arrived at, around the foot she was stationed for the. Halsey used the diary since the a method through which to fairly share this lady viewpoint and you may issues, and pencil essential lookup notes, and you will should do therefore for the next 40-a couple of years, up to she abandoned it throughout the her escape from Blade Feet. New journal is actually later retrieved from the ONI within the 2553, and you will is actually designated top-secret. 
Throughout their questionnaire travels to your Spartan-II applicants, Halsey expanded attached to Jacob Keyes. Both was indeed working in a partnership in the early 2520s, and in 2525, Halsey offered birth to help you Miranda and you will elevated the girl for some decades, whenever towards July several, 2531, Miranda’s father accessible to just take the woman into the, elevating her with the Luna Albuquerque adult hookup. Halsey create later has a falling-out with Miranda, who would later on transform this lady court title to this lady dad’s and you may refuse to keep in touch with Halsey for several years. 
Dr. Halsey supported given that a technological agent into Workplace off Naval Intelligence from 2515 so you’re able to 2522, whenever she was created captain researcher.  She generated huge efforts to many ONI Point III methods, for instance the creation and you may implementation regarding AI constructs. She composed and you may started the SPARTAN-II System, and you may customized the brand new Mjolnir armour program. These types of medical advancements the turned out to be essential improvements for the UNSC, while they was indeed in the course of time accountable for ensuring the survival out of humankind.
In the 2517, within period of 25, Dr. Halsey helmed the brand new SPARTAN-II Program; Spartan-II would would a unique generation away from supersoldiers based upon the newest before really works of the ORION Venture playing with abducted students. Setting-up a couple of rigorous hereditary conditions so you can monitor prospective individuals, she understood 150 college students for the program, however, ONI manage simply offer her enough money to rehearse 75. Thus Halsey produced plans to generally meet each of the people in check to determine exactly who her 75 applicants might possibly be. At her request, Junior Lieutenant Jacob Keyes implemented the woman when you look at the interview off John-117. Abreast of choosing her applicants, she following encountered the children abducted off their homes and you will produced into the entire world Take studies. The fresh ‘recruited’ students have been substituted for thumb clones, and therefore at some point passed away inside many years out of various neurologic and you can mental illness due to challenge as a result of the fresh unperfected thumb cloning techniques.